Acta Metall Sin  1990, Vol. 26 Issue (1): 38-45    DOI:

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TRANSFORMATION OF RETAINED AUSTENITE IN CARBURIZED CASE DURING FATIGUE CRACK GROWTH

JING Xiaotian;LOU Bingzhe;CU Chenqing;SHEN Fusan Shaanxi Institute of Mechanical Engineering Xi'an Dept.of Materils;Shanxi Institute of Mechanical Engineering Xi'an 710048

JING Xiaotian;LOU Bingzhe;CU Chenqing;SHEN Fusan Shaanxi Institute of Mechanical Engineering Xi'an Dept.of Materils;Shanxi Institute of Mechanical Engineering Xi'an 710048. TRANSFORMATION OF RETAINED AUSTENITE IN CARBURIZED CASE DURING FATIGUE CRACK GROWTH. Acta Metall Sin, 1990, 26(1): 38-45.

Abstract References Related Articles Recommended Metrics Download:  PDF(1143KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The morphology of the retained austenite in the carburized case overthe 20CrNiMo steel and its transformation during fatigue crack propagation throughthe case were investigated by using X-ray and TEM analysis. In the carburizedcase, both film and block shared retained austenite were found. The fatigue crackis inclined to pass through the block shaped retained austenite and thereby stimu-lates its strain-induced martensitic transformation, due to the effect of the orienta-tion relationship between the surfaces. During the process of the fatigue fracture,most of the retained austenite on the crack path are transformed into the marten-site, and the untransformed amounts on the fracture are remained less than 6%. Thetransformation of retained austenite, which is restricted mainly within the plasticzone, occurs only in the time of the fracture, and is independent of external stressesand stress ratios and cyclic numbers. The volume expansion accompanided by itstransformation creates an additional residual displacement of about 0.44μm oncracked surfaces, which is relevent in the magnitude to the plasticity-induced residualdisplacement. The phase transformation induced fatigue crack closure is believed tobe an important factor affecting the fatigue crack behaviors in the high carbonlayer of the carburized case. Key words:  retained austenite      fatigue crack growth      strain induced martensite transformation      phase transformation induced crack closure      Received:  18 January 1990      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1990/V26/I1/38 1 Webster D. 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